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Rapid speciation of trace iron in rainwater by reverse flow injection analysis coupled to a long path length liquid waveguide capillary cell and spectrophotometric detection

Citation

Huang, Y and Yuan, D and Ma, J and Zhang, M and Chen, G, Rapid speciation of trace iron in rainwater by reverse flow injection analysis coupled to a long path length liquid waveguide capillary cell and spectrophotometric detection, Microchimica Acta, 166, (3) pp. 221-228. ISSN 0026-3672 (2009) [Refereed Article]

Copyright Statement

Copyright 2009 Springer-Verlag

DOI: doi:10.1007/s00604-009-0193-8

Abstract

A method for speciation and determination of low levels of dissolved iron in rainwater was established by coupling reverse flow injection analysis with a 2-m liquid waveguide capillary cell and spectrophotometric detection. Ferrozine solution was injected into a sample stream to form an Fe(II)-ferrozine complex with Fe(II), and the absorbance of this complex was detected at both 562nm and 625nm with a reference wavelength at 700nm. Fe(III) was analyzed in the same manner after being reduced to Fe(II) by ascorbic acid. The optimum conditions and the interference of Cu(I), Ni(II) and Co(II) were investigated. The limits of detection were 0.1nM for Fe(II) and 0.2nM for Fe(III), while the linear ranges were 0.4 200nM for Fe(II) and 0.8 287 nM for Fe(III) at 562nm, and can be extended to higher concentrations with the detection at a less sensitive wavelength of 625nm. The sample throughput was 6h−1, and the total sample volume consumed was 10mL. This method has been successfully applied to analyze dissolved iron in rainwater of Xiamen from August to November, 2008. The lowest level of iron in rainwater was observed during typhoon events. By adopting reverse flow injection analysis coupled with liquid waveguide long path length capillary cell, the reagent consumption was low and the sensitivity was enhanced. The other advantages of this method are high sample throughput, wide linear dynamic range and high selectivity for Fe(II).

Item Details

Item Type:Refereed Article
Keywords:dissolved iron, speciation, reverse flow injection analysis, liquid waveguide capillary cell, rainwater
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Flow Analysis
Objective Division:Environment
Objective Group:Rehabilitation of Degraded Environments
Objective Field:Rehabilitation of Degraded Fresh, Ground and Surface Water Environments
Author:Zhang, M (Dr Min Zhang)
ID Code:104700
Year Published:2009
Web of Science® Times Cited:16
Deposited By:Chemistry
Deposited On:2015-11-18
Last Modified:2016-03-30
Downloads:0

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